EP0697674B1 - Strichkodeleser - Google Patents

Strichkodeleser

Info

Publication number
EP0697674B1
EP0697674B1 EP95202193A EP95202193A EP0697674B1 EP 0697674 B1 EP0697674 B1 EP 0697674B1 EP 95202193 A EP95202193 A EP 95202193A EP 95202193 A EP95202193 A EP 95202193A EP 0697674 B1 EP0697674 B1 EP 0697674B1
Authority
EP
European Patent Office
Prior art keywords
window
scan lines
housing
mirror means
bar code
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95202193A
Other languages
English (en)
French (fr)
Other versions
EP0697674A1 (de
Inventor
Cornelis Reinier Johannes Schonenberg
Laurentius Wilhelmus Nunnink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scantech International BV
Original Assignee
Scantech BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19864517&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0697674(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Scantech BV filed Critical Scantech BV
Publication of EP0697674A1 publication Critical patent/EP0697674A1/de
Application granted granted Critical
Publication of EP0697674B1 publication Critical patent/EP0697674B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10831—Arrangement of optical elements, e.g. lenses, mirrors, prisms

Definitions

  • the present invention relates to an apparatus for scanning bar code on an article, comprising:
  • Such apparatus or bar code scanners
  • These are being used on increasingly larger scale in Western Europe and the United States in supermarkets and the like. These are usually scanners disposed in fixed horizontal or vertical position along which an article purchased by the customer must be moved.
  • Such known apparatus is usually built-in, which is time-consuming and cost-intensive.
  • These bar code scanners also display the defect that particular articles often have to be moved repeatedly past a window thereof due to an insufficiently accurate operation. This frequently results in damage to this window.
  • Such built-in scanner is also disclosed in WO 89/05013 which known scanner apparatus has twelve fixed mirrors for obtaining pairs of parallel lines in six scanning directions. This arrangement is bulky and is only suited for mounting in a check out counter.
  • Known bar code scanners use mirrors that are made by using adhesives to attach the light reflecting surface to their rotatable members. Although these mirrors have been used in many years in bar code readers, their use poses a number problems.
  • An apparatus according to the present invention wherein the mirror surfaces on the rotatable member are vapour-deposited mirrors.
  • This provides for very lightweight rotating mirrors instead of heavy mirrors using adhesives.
  • a polygon (rotatable member) made of vapour-deposited mirrors has a weight of 3 g instead of more than 100 g for the prior known polygon.
  • the low weight allows for a higher rotating speed of the rotating mirror, e.g. up to 9,000 rpm instead of 400 rpm.
  • a higher rotating speed allows for a faster scan of the bar code, i.e. the article can be moved faster along the scanner, which improves the performance of the scanner and diminishes the scan time needed for scanning.
  • the apparatus according to the present invention will usually be installed in an upright position - see also co-pending the EP-A-0224996.
  • the bar code is likely to pass a number of the scanning lines improving the chance that the bar code is recognized.
  • the apparatus according to the present invention has proven to be very eager or greedy in recognizing bar codes, even bar codes consisting of relatively short height bar code (truncated bar codes).
  • the chance of recognition is substantially independent of the direction (OMNI-directional), as the scan lines diverge and converge in the direction in which the article is moved, viz. towards the window.
  • the scan lines form a "sweet spot" on a predetermined distance of the window, where the density of the scan lines is very high.
  • the apparatus according to the present invention is particularly suitable for applications where little space is available to move articles with a bar code there along.
  • the apparatus according to the present invention can be placed standing upright on a surface and the bar code on objects can be read by moving the objects toward and/or away form the window at a distance therefrom without contact with this window being necessary, thus preventing damage to this window.
  • the scanning pattern preferably comprises one or more lines parallel to a first side of this window in addition to one or more lines parallel to a second side of this window with, i.e. perpendicular of the first direction.
  • a pattern of preferably three parallel lines in each case L 1 , L 2 , L 3 , L 4 , L 5 , L 6 , L 7 respectively L 8 is generated by the apparatus, which lines traverse a large part of the window since in the present case these lines extend at seven different angles relative to a side of the window, while they have a relatively short length, whereby the apparatus can remain compact in terms of internal structure.
  • the lines have a length for instance of less than half the height H or width W of the window.
  • the scan lines form on the window approximately a reverse U built up of seven groups of three parallel straight lines above which extend a further three parallel straight lines.
  • the directions L 1 and L 7 extend roughly parallel to the first side, while lines L 4 and L 8 extend parallel to the other side of the window.
  • fig. 2 where the pattern P is shown at a distance from the window, wherein this pattern P presents a view differing clearly from that shown in fig. 1.
  • Accommodated in housing 2 is a single multi-layer board 4 on which are arranged diverse electronic components including a processor (ASIC) 5 for processing the bar code information in addition to a laser light source 6 which via fixedly disposed mirrors 7, 8 and 9 generates a beam B to a rotating member 10 which is rotated at high rotation speed by a motor 10' and on which three comparatively large mirror surfaces 11, 12 and 13 as well as three comparatively small mirror surfaces 14, 15 and 16 are vapour deposited.
  • ASIC processor
  • the laser beam B is projected outside as scan lines in the pattern P via fixedly disposed mirrors 17, 18, 19, 20, 21, 22 and 23 and via window 3.
  • a line L 2 for instance of the pattern P is shown in the figures by means of the full arrow line and the broken arrow line.
  • a cylindrical lens is preferably arranged close to the (semiconductor) laser light source for making oval -long axis in a direction perpendicular to the scanning direction- the cross section of the laser light beam B, for instance to an extent such that the largest diameter of the "spot" is twice as large as the smallest diameter thereof in a direction perpendicularly of the scan lines, whereby a bar of the bar code, i.e. a white strip thereof, impinged upon by a scan line reflects in each case a comparatively large quantity of laser light of the beam B, while the resolution in the scanning direction is not affected, which it has been found greatly enhances the accuracy of the scanning. Inaccuracies or stains on the bar code, such as hairs, will thus not be identified as a bar thereof, because of the limited influence on the enlarged scan spot.
  • the laser light source 6 is placed in a holder 86 (see also fig. 11 and 12) which is provided with an aperture 87 in which the laser light source 6 is placed and with cooling fins 88 for spreading the heat dissipated by the laser light source 6.
  • the motor 10' is preferably a three-phase electric motor wherein the shaft of the rotating member 10 is driven by two solenoids at a time, while from the third solenoid a pulse can be derived which serves as counting pulse for counting the rotation speed of the electric motor.
  • a pulse can be derived which serves as counting pulse for counting the rotation speed of the electric motor.
  • Shown schematically in fig. 4-9 is the manner in which the laser beam B coming from the laser source 6 passes over the various mirrors on the rotatable member 10.
  • the fixedly disposed mirror 20 under the fixedly disposed mirror 9 and directly opposite the rotatable member is slightly larger than the adjacent mirrors 17, 18, 19 resp. 21, 22 and 23.
  • a first relatively large mirror for instance 13 (see also fig. 3)
  • the laser beam exits at a first angle a1.
  • the laser beam is then reflected against the relatively small mirror 14 which reflects the laser beam against the protruding portion 20a of mirror 20, whereby the laser beam exits at an angle a2.
  • an exit at an angle a3 is then obtained, while against the relatively small mirror 16 an exit at an angle a4 is obtained.
  • the angles a5 and a6 are associated with the respective mirrors 12 and 15 on rotatable member 10.
  • the different angles of exit can be seen on the window 3 in fig. 1 as the six lines L 8 and L 4 which extend mutually parallel on this window.
  • a component 40 which is preferably a single injection moulded component in which the other components can be assembled in simple manner.
  • a lens 40 which is placed in front of a detector (not shown in fig. 10) and is preferably moulded from plastic, such as polycarbonate, is preferably snapped fixedly in dustproof manner into an opening 42 in the plastic component (see also fig. 13).
  • the lens element 41 made in one piece is provided with resilient legs 91 provided with further elements 92 for snapping-in of these legs into recesses in the injection moulded part 40.
  • the lens element 41 is further provided with a cam part 93 for radially correct positioning thereof in this injection moulded part.
  • the lens part 94 is preferably of ellipsoidal form, which further increases the precision of the apparatus according to the present invention since aberrations occurring with a spherical surface are avoided. It has further been found that, also when the light is diffused, such a form of the lens surface accurately focuses this laser light within a distance of 150-450 mm from the lens surface, which corresponds with the space directly in front of the window to a distance of about 30 cm in front of the window.
  • the laser source 6 provided with a sealing ring 43 is placed through an opening 44 in the component 40.
  • the component 40 is provided with a separate sealing edge part 45, for instance of rubber.
  • the window 3 can hereby easily be cleaned and/or replaced.
  • the motor is arranged in a recess (not shown in fig. 10) in the component 40 (see fig. 2), while an opening 48 is also provided which, using a seal 49, enables access in optical manner via the window to electronics on the side of the board 4 facing toward the window, for instance for taking out an EPROM, in sporadically occurring cases, via removal of the window without the other components having to be disconnected.
  • This replacing of the EPROM must of course be carried out only by an expert technician, all the more so as it must be ensured at all times that the space behind the window remains free of dust.
  • the window will not have to be replaced frequently since comparatively little damage thereto will occur due to the absence of contact between window and object.
  • a single window will preferably therefore suffice.
  • the front window had to be replaced frequently, wherein the rear window served to keep free of dust the space in which the mirror means were arranged.
  • the window glass has been made of scratch resistant material.
  • Fig. 10 also shows that the board 4 is also provided on the rear side with electronic components 50, 51 and 52 whereby a single board can suffice.
  • the board is further provided with openings 53 and 54 through which pin parts 55, 56 respectively of component 40 can be placed to position this component 40 in housing 2 independently of the printed-circuit board.
  • the mirror 7 is precisely adjustable relative to the laser source 6 arranged on the printed-circuit board 4 using adjusting screws 61, 62 and 63 in addition to spring elements 64 and 65.
  • the detector designated with numeral 71, on which is collected the radiation reflected from the bar code and collected by lens 41.
  • mirror part 8 covers only a small portion of a plate 78 which is otherwise transparent. The mirror surface 8 is preferably obtained via vapour deposition on plate 78.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Artificial Intelligence (AREA)
  • Toxicology (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Credit Cards Or The Like (AREA)
  • Eye Examination Apparatus (AREA)

Claims (10)

  1. Vorrichtung zum Scannen des Strichcodes an einem Artikel, die folgendes aufweist:
    ein Gehäuse (2), das mit einem Fenster (3) versehen ist,
    eine in dem Gehäuse angeordnete Laserlichtquelle (6), die einen Laserstrahl erzeugt,
    eine erste Spiegeleinrichtung (7, 8, 9, 17, 18, 19, 20, 21, 22, 23), die fest in dem Gehäuse (2) angeordnet ist und den Laserstrahl reflektiert,
    ein in dem Gehäuse (2) für ein drehbares Antreiben angebrachtes Glied (10), das mit einer zweiten, drehbaren Spiegeleinrichtung (11, 12, 13, 14, 15, 16) versehen ist,und
    einen Detektor (71), der das von dem Strichcode kommende Laserlicht erfaßt, das von der feststehenden Spiegeleinrichtung (7, 8, 9, 17, 18, 19, 20, 21, 22, 23) und der drehbaren Spiegeleinrichtung (11, 12, 13, 14, 15, 16) reflektiert und durch das Fenster (3) eingelassen wird,
       dadurch gekennzeichnet, daß die Spiegelflächen an dem Glied (10) aufgedampfte Spiegel sind.
  2. vorrichtung nach Anspruch 1, wobei die feststehende und die drehbare Spiegeleinrichtung so angeordnet sind, daß eine an dem Fenster (3) zu sehende Anordnung bzw. ein Muster aus einer verhältnismäßig großen Anzahl von relativ kurzen Abtastlinien (11, 12, 13, 14, 15, 16, 17, 18) erzeugt wird, die sich zum Teil gegenseitig überlappen, und wobei die Abtastlinien zunächst relativ zueinander konvergieren zu einem Bereich in einem vorbestimmten Abstand von dem Fenster (3), und wobei die Abtastlinien hinter diesem Bereich in der von dem Fenster (3) wegzeigenden Richtung wieder divergieren, so daß dieser Bereich, z.B. in einem Abstand von dem Fenster (3) von 0-30cm, von den Abtastlinien jeweils mit einem unterschiedlichen Winkel durchlaufen wird.
  3. Vorrichtung nach Anspruch 2, wobei die kurzen Abtastlinien erste Abtastlinien aufweisen, die horizontal verlaufen, sowie zweite Abtastlinien, die annähernd rechtwinklig dazu verlaufen, wenn sich die vorrichtung in aufrechter Lage befindet.
  4. vorrichtung nach Anspruch 3, wobei eine oder mehrere Abtastlinien in einem Winkel zueinander verlaufen (erste und zweite Richtung).
  5. vorrichtung nach Anspruch 4, wobei eine oder mehrere Abtastlinien in Bezug auf eine Seite des Fensters in wenigstens vier unterschiedlichen Winkeln verlaufen.
  6. Vorrichtung nach Anspruch 4, wobei eine oder mehrere Abtastlinien in Bezug auf eine Seite des Fensters in wenigstens sechs unterschiedlichen Winkeln verlaufen.
  7. Vorrichtung nach irgendeinem der Ansprüche 1-6, wobei die Linien des Abtastmusters in vier unterschiedlichen Winkeln jeweils drei parallele Linien aufweisen.
  8. Vorrichtung nach irgendeinem der Ansprüche 2-7, wobei das Abtastmuster sieben Gruppen mit jeweils einer Mehrzahl von parallelen Linien aufweist, die in etwa ein umgekehrtes U bilden.
  9. Vorrichtung nach irgendeinem der Ansprüche 1-8, wobei über dem U eine Mehrzahl paralleler Linien verläuft.
  10. Vorrichtung nach irgendeinem der Ansprüche 1-9, wobei auf einer Seite des Abtastmusters eine Mehrzahl paralleler Linien vorhanden ist, die von einer Mehrzahl relativ kleiner Spiegelflächen an dem Glied erzeugt werden.
EP95202193A 1994-08-11 1995-08-11 Strichkodeleser Expired - Lifetime EP0697674B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9401302A NL9401302A (nl) 1994-08-11 1994-08-11 Barcode scanner.
NL9401302 1994-08-11

Publications (2)

Publication Number Publication Date
EP0697674A1 EP0697674A1 (de) 1996-02-21
EP0697674B1 true EP0697674B1 (de) 1998-11-25

Family

ID=19864517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95202193A Expired - Lifetime EP0697674B1 (de) 1994-08-11 1995-08-11 Strichkodeleser

Country Status (5)

Country Link
US (1) US5689102A (de)
EP (1) EP0697674B1 (de)
AT (1) ATE173844T1 (de)
DE (1) DE69506190T2 (de)
NL (1) NL9401302A (de)

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US6491222B1 (en) * 1996-10-09 2002-12-10 Symbol Technologies, Inc. Optical path design for scanning assembly in compact bar code readers
US7387253B1 (en) * 1996-09-03 2008-06-17 Hand Held Products, Inc. Optical reader system comprising local host processor and optical reader
US6758402B1 (en) * 1994-08-17 2004-07-06 Metrologic Instruments, Inc. Bioptical holographic laser scanning system
US7051922B2 (en) 1994-08-17 2006-05-30 Metrologic Instruments, Inc. Compact bioptical laser scanning system
DE19619479A1 (de) * 1996-05-14 1997-11-20 Sick Ag Verfahren und Vorrichtung zum Lesen eines auf einem Codeträger vorgesehenen Codes
US20040004128A1 (en) * 1996-09-03 2004-01-08 Hand Held Products, Inc. Optical reader system comprising digital conversion circuit
NL1004654C2 (nl) * 1996-11-29 1998-07-02 Scantech Bv Inrichting en werkwijze voor het aftasten van artikelen met een code.
JP3628867B2 (ja) * 1997-04-24 2005-03-16 東芝テック株式会社 バーコード読取装置
FR2766943B1 (fr) * 1997-07-30 1999-10-15 United Barcode Ind Scanner Tec Dispositif optoelectronique d'acquisition multidirectionnelle d'images de plans-objets, notamment de codes a barres
JPH11112097A (ja) * 1997-09-30 1999-04-23 Fujitsu Ltd 光源モジュールおよび光走査装置
US5975417A (en) * 1997-12-19 1999-11-02 Ncr Corporation Convertible barcode scanner
US6045046A (en) * 1998-08-27 2000-04-04 Ncr Corporation Full coverage barcode scanner
US6543694B1 (en) 1999-03-29 2003-04-08 Ncr Corporation Extended coverage barcode scanner
US6237851B1 (en) 1999-03-29 2001-05-29 Ncr Corporation Dual mode barcode scanner
DE10008635A1 (de) † 2000-02-24 2001-09-06 Basf Ag Verfahren zur Herstellung von Polyetherpolyolen
US6918540B2 (en) * 2000-04-18 2005-07-19 Metrologic Instruments, Inc. Bioptical point-of-sale (pos) scanning system employing dual polygon-based laser scanning platforms disposed beneath horizontal and vertical scanning windows for 360° omni-directional bar code scanning
US20030132291A1 (en) 2002-01-11 2003-07-17 Metrologic Instruments, Inc. Point of sale (POS) station having bar code reading system with integrated internet-enabled customer-kiosk terminal
US7100832B2 (en) 2000-04-18 2006-09-05 Metrologic Instruments, Inc. Bioptical laser scanning system providing 360° of omnidirectional bar code symbol scanning coverage at point of sale station
JP4330762B2 (ja) 2000-04-21 2009-09-16 富士フイルム株式会社 マルチビーム露光装置
US7083102B2 (en) * 2002-01-11 2006-08-01 Metrologic Instruments, Inc. Bioptical laser scanner for six-sided 360° Pos-based scanning
US7296748B2 (en) * 2002-01-11 2007-11-20 Metrologic Instruments, Inc. Bioptical laser scanning system providing 360° of omnidirectional bar code symbol scanning coverage at point of sale station
US6874690B2 (en) * 2002-01-11 2005-04-05 Metrologic Instruments, Inc. Modular omnidirectional bar code symbol scanning system with at least one service port for removable installation of scan module insert
WO2003101243A1 (fr) * 2002-05-31 2003-12-11 Ya-Man Ltd. Appareil d'epilation au laser
US7296737B2 (en) * 2003-04-07 2007-11-20 Silverbrook Research Pty Ltd Shopping receptacle with in-built scales
US7073716B2 (en) * 2003-09-05 2006-07-11 Ncr Corporation Barcode scanner with dual-surface polygon
JP4402642B2 (ja) * 2005-11-30 2010-01-20 富士通株式会社 読取装置および読取方法
JP4388116B2 (ja) * 2007-11-26 2009-12-24 東芝テック株式会社 バーコード読取装置
WO2009127890A1 (en) * 2008-04-17 2009-10-22 Datalogic Automation S.R.L. System for automatically acquiring optically coded information, illuminator for said system and method for aligning with each other optical components of the system.
US8523076B2 (en) 2012-01-10 2013-09-03 Metrologic Instruments, Inc. Omnidirectional laser scanning bar code symbol reader generating a laser scanning pattern with a highly non-uniform scan density with respect to line orientation
USD723560S1 (en) * 2013-07-03 2015-03-03 Hand Held Products, Inc. Scanner
KR101674062B1 (ko) * 2015-11-09 2016-11-08 주식회사 오토시스 광 스캐너

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Also Published As

Publication number Publication date
DE69506190T2 (de) 1999-04-15
DE69506190D1 (de) 1999-01-07
NL9401302A (nl) 1996-03-01
ATE173844T1 (de) 1998-12-15
US5689102A (en) 1997-11-18
EP0697674A1 (de) 1996-02-21

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